If your primary vehicle is the Jeep, you don't really notice the subtle waning lack of performance until it gets so bad your bushings go and your dog won't. If the jeep was previously owned and lifted, there are big ranges of lift covered by one size, so it's hard to get the wrong size. Installation is tricky if you don't do your own work. If you have any mechanical skills, you will eventually figure it out. For example, the shift spins when fastening the top nut on the front two. Remedy: fix a pr of vice clamps to the shaft and let them rest against the frame to prevent the spin. Little tricks such as the aforementioned will make the job fun and less time consuming. Post installation, you will never believe you put up with such a turbulent ride. You will also see the shape of the bushing and understand how much force those things take. Lastly, there are less expensive shocks, but unless you really enjoy annual replacement, these come with a three year warrantee and you saved on the install. Small price to pay for a 90% improved ride. The other ten will happen when the from stabilizer is installed. Happy Jeepster!!